
	
  var num = 200
  var w = window.innerWidth
  var h = window.innerHeight
  var max = 100
  var _x = 0
  var _y = 0
  var _z = 150
  var dtr = function (d) {
    return d * Math.PI / 180
  }

  var rnd = function () {
    return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180)
  }
  var dist = function (p1, p2, p3) {
    return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2))
  }

  var cam = {
    obj: {
      x: _x,
      y: _y,
      z: _z
    },
    dest: {
      x: 0,
      y: 0,
      z: 1
    },
    dist: {
      x: 0,
      y: 0,
      z: 200
    },
    ang: {
      cplane: 0,
      splane: 0,
      ctheta: 0,
      stheta: 0
    },
    zoom: 1,
    disp: {
      x: w / 2,
      y: h / 2,
      z: 0
    },
    upd: function () {
      cam.dist.x = cam.dest.x - cam.obj.x
      cam.dist.y = cam.dest.y - cam.obj.y
      cam.dist.z = cam.dest.z - cam.obj.z
      cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z)
      cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z)
      cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z)
      cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z)
    }
  }

  var trans = {
    parts: {
      sz: function (p, sz) {
        return {
          x: p.x * sz.x,
          y: p.y * sz.y,
          z: p.z * sz.z
        }
      },
      rot: {
        x: function (p, rot) {
          return {
            x: p.x,
            y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
            z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
          }
        },
        y: function (p, rot) {
          return {
            x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
            y: p.y,
            z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
          }
        },
        z: function (p, rot) {
          return {
            x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
            y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
            z: p.z
          }
        }
      },
      pos: function (p, pos) {
        return {
          x: p.x + pos.x,
          y: p.y + pos.y,
          z: p.z + pos.z
        }
      }
    },
    pov: {
      plane: function (p) {
        return {
          x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
          y: p.y,
          z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
        }
      },
      theta: function (p) {
        return {
          x: p.x,
          y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
          z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
        }
      },
      set: function (p) {
        return {
          x: p.x - cam.obj.x,
          y: p.y - cam.obj.y,
          z: p.z - cam.obj.z
        }
      }
    },
    persp: function (p) {
      return {
        x: p.x * cam.dist.z / p.z * cam.zoom,
        y: p.y * cam.dist.z / p.z * cam.zoom,
        z: p.z * cam.zoom,
        p: cam.dist.z / p.z
      }
    },
    disp: function (p, disp) {
      return {
        x: p.x + disp.x,
        y: -p.y + disp.y,
        z: p.z + disp.z,
        p: p.p
      }
    },
    steps: function (_obj_, sz, rot, pos, disp) {
      var _args = trans.parts.sz(_obj_, sz)
      _args = trans.parts.rot.x(_args, rot)
      _args = trans.parts.rot.y(_args, rot)
      _args = trans.parts.rot.z(_args, rot)
      _args = trans.parts.pos(_args, pos)
      _args = trans.pov.plane(_args)
      _args = trans.pov.theta(_args)
      _args = trans.pov.set(_args)
      _args = trans.persp(_args)
      _args = trans.disp(_args, disp)
      return _args
    }
  };

  (function () {
    "use strict"
    var threeD = function (param) {
      this.transIn = {}
      this.transOut = {}
      this.transIn.vtx = (param.vtx)
      this.transIn.sz = (param.sz)
      this.transIn.rot = (param.rot)
      this.transIn.pos = (param.pos)
    }

    threeD.prototype.vupd = function () {
      this.transOut = trans.steps(
        this.transIn.vtx,
        this.transIn.sz,
        this.transIn.rot,
        this.transIn.pos,
        cam.disp
      )
    }

    var Build = function () {
      this.vel = 0.04
      this.lim = 360
      this.diff = 200
      this.initPos = 100
      this.toX = _x
      this.toY = _y
      this.go()
    }

    Build.prototype.go = function () {
      this.canvas = document.getElementById("canvas")
      this.canvas.width = window.innerWidth
      this.canvas.height = window.innerHeight
      this.$ = canvas.getContext("2d")
      this.$.globalCompositeOperation = 'source-over'
      this.varr = []
      this.dist = []
      this.calc = []

      for (var i = 0, len = num; i < len; i++) {
        this.add()
      }

      this.rotObj = {
        x: 0,
        y: 0,
        z: 0
      }
      this.objSz = {
        x: w / 5,
        y: h / 5,
        z: w / 5
      }
    }

    Build.prototype.add = function () {
      this.varr.push(new threeD({
        vtx: {
          x: rnd(),
          y: rnd(),
          z: rnd()
        },
        sz: {
          x: 0,
          y: 0,
          z: 0
        },
        rot: {
          x: 20,
          y: -20,
          z: 0
        },
        pos: {
          x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
          y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
          z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
        }
      }))
      this.calc.push({
        x: 360 * Math.random(),
        y: 360 * Math.random(),
        z: 360 * Math.random()
      })
    }

    Build.prototype.upd = function () {
      cam.obj.x += (this.toX - cam.obj.x) * 0.05
      cam.obj.y += (this.toY - cam.obj.y) * 0.05
    }

    Build.prototype.draw = function () {
      this.$.clearRect(0, 0, this.canvas.width, this.canvas.height)
      cam.upd()
      this.rotObj.x += 0.1
      this.rotObj.y += 0.1
      this.rotObj.z += 0.1

      for (var i = 0; i < this.varr.length; i++) {
        for (var val in this.calc[i]) {
          if (this.calc[i].hasOwnProperty(val)) {
            this.calc[i][val] += this.vel
            if (this.calc[i][val] > this.lim) this.calc[i][val] = 0
          }
        }

        this.varr[i].transIn.pos = {
          x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
          y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
          z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
        }
        this.varr[i].transIn.rot = this.rotObj
        this.varr[i].transIn.sz = this.objSz
        this.varr[i].vupd()
        if (this.varr[i].transOut.p < 0) continue
        var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2)
        this.$.globalCompositeOperation = 'lighter'
        g.addColorStop(0, 'hsla(255, 255%, 255%, 1)')
        g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)')
        g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)')
        this.$.fillStyle = g
        this.$.beginPath()
        this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false)
        this.$.fill()
        this.$.closePath()
      }
    }
    Build.prototype.anim = function () {
      window.requestAnimationFrame = (function () {
        return window.requestAnimationFrame ||
          function (callback, element) {
            window.setTimeout(callback, 1000 / 60)
          }
      })()
      var anim = function () {
        this.upd()
        this.draw()
        window.requestAnimationFrame(anim)
      }.bind(this)
      window.requestAnimationFrame(anim)
    }

    Build.prototype.run = function () {
      this.anim()

      window.addEventListener('mousemove', function (e) {
        this.toX = (e.clientX - this.canvas.width / 2) * -0.8
        this.toY = (e.clientY - this.canvas.height / 2) * 0.8
      }.bind(this))
      window.addEventListener('touchmove', function (e) {
        e.preventDefault()
        this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8
        this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8
      }.bind(this))
      window.addEventListener('mousedown', function (e) {
        for (var i = 0; i < 100; i++) {
          this.add()
        }
      }.bind(this))
      window.addEventListener('touchstart', function (e) {
        e.preventDefault()
        for (var i = 0; i < 100; i++) {
          this.add()
        }
      }.bind(this))
    }
    var app = new Build()
    app.run()
  })()

